|SOURCE|
[Common::FontCreator]
* Added an instance of GUIManager
* GUI Manager is called for rendering in Execute and has its renderer set
[Common::GUI]
* Moved RenderDebugOverlay to the private scope
* Render added to allow for one point to call rendering functions
* ToggleDebugRendering switches the debug rendering overlay on or off
[Common::GUIElement]
* Added a new GetDebugOutlineColour varient to return the debug outline colour
  as a Colour struct